Oil-well swab-tripping device



.'Ian. 3, 1.928.

w. H. HARDMAN OIL WELL SWAB TRIPPING' DEVICE Filed Jari. '2. 1927 I, nu?

Patented Jan. 3, 1928.

winnaar H.' HARDMAN, or MoRRIsoN, OKLAHOMA.

in-WELL swAB-TBIPPING DEVICE;

vApplication led January 7, 1327. Serial No. 159,672'.

This invention relates to "swabs for oil wells andha's for its object the vprovision of a simple and eilicient mechanism whereby 'a swab may be released if itl should'bind in the oil well casing so that the swabbing tool o may be withdrawn. The invention is illusvice tripped.

trated in the accompanying drawingl and will be hereinafter fully set forth. A In the drawing: y

Figure 1 is an elevation of a device embodyingthe invention; ,f

Fig.' L), is a longitudinal section of the same on the line 2-2 of Fig. 1, and

Fig. 3 is a detail section showing the "de- The tool of the present invention embodies a head 1 which is constructed at-its upper end with a threaded studv 2 or otherwise formed whereby it may be secured to the drilling rod, and it may be formed with the usual wrench seats 3. This head 1 has a longitudinal bore, indicated at 4, which is expanded at its lower end 5 to receive the upper end of a swab-carrying tube 6 whereby the tube may be secured in the head, the swab rubbers 7 being mounted onsaid tube to bear against the casing 8 in the usual manner. The lower end of the tube 6 is closed by a plug 9 bored centrally to admit liquid, and extending axially through the tube is a rod 10 having its upper end reduced whereby it may extend into the bore 4 of the head and have sliding movement therein, an

expansion spring 11 being fitted in the upper extremity of the bore to bear upon the upper end of the rod and tend constantly to maintain the rod in a lowered position. The upper extremity of the rod is enlarged to define an abrupt annular shoulderlQ beneath which is engaged the end of a set bolt 13 mounted in the head to normally support the rod, as shown in Fig. 2. Below the bolt, an annular shoulder 1 4 is` on the rod, the space between the shoulders 13 and 14 being suicient to accommodate the movement of the rod when the device is tripped as hereinafter described. The diameter of the rod below the shoulder 14 is approximately equal to the diameter of the bore of the head providing a smooth surface terminating at a lower abrupt shoulder 15 and presenting a bearing for the working end of a latch 16. The head is provided with a longitudinal slot- 17 in which the latch is pivoted at its lower end, and a lea-t' formed` spring 18 is secured to the head so as to extend over the hitch and bear thereon to hold the upper free end of the latch against the l -rod. Then the device is tri ined', the latch engages under the shoulder 15, and, to iacilitate its release, asocket 19fis provided in the side of the latch 'near its upper end to aline'with a transverse recess 20 in the head whereby anyconvenieut pointed tool may be engaged with the latch to move the same vagainst the orceof the spring. A valve .stem

21 is extended, axially-through the plug 9 vand has its Vupper end secured in a cap 22 which is slidably mounted lupon the lower end of the rod 10 aboutan annular flange Q3 formed upon the lower extremity of the rod, as shown in Fig. 2. The valve stem projects below the plug and is equipped with an enlarged foot 24, the upper end of the stein being enlarged and constituting thc valve head or valve proper.

In the normal operation of the device,

the rod is supported by the shoulder 12 resting on the end of the' bolt 13, the spring 11 acting to maintain the engagement. an

Should the swab stick, for any reason, the entire device is lowered to the bottom of the well and the foot 24, by reason of its impact with the bottom, will move upwardly relative to the tube, this upward movement bed so the latch being inactive, as shown in Fig. 2.

swab which may then be raised. When the latch is released by engagement of a tool in the socket 19 as above described, the spring 11 at once expands and resets'the parts in the normal positions shown in Fig. 2. In the normal position, the Valve seats on the plug 9 on the up stroke of the tube but moves upward relative thereto on the down stroke of the tube to effect the pumping action in an obvious manner.

The' tool is very simple in construction and the several parts are compactly ar ranged. It may be produced at a low cost and in use proves efficient for the purpose for which it is designed. It will be understood that the invention may be embodied in swabs of various styles.

Having thus described the invention, I claim:

l. A swabbingtool comprising a head, a

i' rod slidably mounted in the head, and a engaging the rod to releasably latch mounted in the side of the head and support the Same.

2. A swabbing tool comprising a head, a tube dependingr from the head, a rod slidably mounted in the head and extending into the tube, a valve swiveled upon the lower end of the rod, annular shoulders upon the "f rod at the upper end thereof, a latch pivotally mounted in the head normally 'free of the rod and adapted to engagey under the lower shoulder, and a supporting element in the head normally engaging` under the upper shoulder.

3. A swabbing tool comprisingr a head, a

rod slidably mounted in therhead, means in the head normally supportingr the rod in a lowered position, means at vthe lower'end of the rod lto effect relative upward movement of the rod, andmeans in the head to support `A the rod in raised position.

5. A swabbing tool comprising a head, a rod slidably mounted in the head and provided with vertically spacedv shoulders, an

expansion spring housed in the head'and bearing on the rod to lower the same, a sup'- porting element in the head normally en.

gaging under the upper shoulder on the rod to support the rod in lowered position, and a latch mounted in the head and yieldably held to the rod to 'engage under the lower shoulder' on the rod and supportthe rod in 'raised position, .the latch and head being constructed to receive a latch-releasing tool. In testimony whereof I affix my sig-nature.

VVILBERT H. HARDMAN.` [Ity s.l 

